Brake-head.



S. J. STRID.

BRAKE HEAD.

APPLICATION FILED JAN. 13, 1909.

926,299. Patented June 29,1909.

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/ JVG/Uk/ S. J. STRID.

BRAKE HEAD.

APPLICATION FILED JAN.13,1909.

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Patented June 29, 1909.

UNITED sTArIEs grnnr orrron.

SVEN ISTRID, OF CHICAGO, ILLINOIS, ASSIGNOR OF THREE-FOURTHS TO ItALII-LG. CCBURN, I

OF CHICAGO, ILLINOIS.

BRAICE-HEAD;

Specification of Letters Patent.

Patented June 29, 1909.

Application filed January 13, 1909. Serial No. 472,043.

To all whom it may concern:

Be it known that I, SVEN J. STRID, a subject of the King of Sweden, residing at-Chicag'o, in the county of Cook and State of Illinois, have invented a new and useful Im- Wing is a specification. My invention relatesto improvements in the construction of brake-heads of a type provement in Brake-Heads, of which the fol employed in connection with brake-beams on railway cars as holders for removable brake-hoesi Brake-beams are commonly suspended from the trucks of railway cars, which in turn are spring-supported upon the car wheel journals. For this and other reasons, where a brake-head is secured in practice rigidly to the brake-beam, the angle of engagement of the shoe with the Wheel varies more or less at different times whereby unequal wear of the shoe is produced with resultant Well known undesirable consequences.

My object is to provide a brake-head of simple, stron and durable construction and so mounted t, at under the force of braking pressure it will readily turn upon the brakeeam and adjust itself to the'tread of the wheel while resisting any tendency to turn under the jarring action of the parts in transit.

'Referring to the accompanying drawings which show my invention 1n the form I prefer to provide-Figure 1 is an elevation of my improved brake-head shown without a brake-shoe and mounted on the end of? a truss brake-beam Fig. 2, a fragmentary side elevation of the brake-head removed; Fig. 3, a plan view of a friction spring employed in the preferred construction; Fig. 4, a side elevation of the spring; Fig. 5, a view in elevation ofacapforming art of the construction; Fig. 6, a sectiona View of a thimble or mufller forming a detail of the construction, the section being taken on line 6 in Fig. 7; Fig. 7, an inner face view of the thimble; Fig. 8, a broken section taken on line 8 in Fig. 1 and Fig. 9, a View similar to Fig. 8 and illustrating a modification.

The brake-beam upon the ends of which the brake-heads are mounted is of truss form and of common construction, havinga compression-bar 10, square in cross-section, and a round tension-rod 11. 12 is a thimble formedin one face with a square socket 13 to receive theend of the bar 10 and having an inclined opening 14 through it for the pas sage of the rod 11. Each end portion of the bar 10 is cut away as indicated at 15 in order to clear the tension-rod. ..The'tl1imble presents a circumferential bearing surface 16, an annular projecting bearing shoulder 17 at its inner end and an annular'reduced bearing shoulder 18 at its outer end. The body 19, or brake-head roper, describes the Well known contour ilustr-ated with the suspension-eye 20. The head has a central opening 21 through it of a size tofit loosely over the bearing surface 16 of the thimble. The inner end portion of the said opening is enlarged to present a shoulder22 fitting against the shoulder 17 of the'thimble, and near the outer end portion of the opening is an annular inwardly projecting shoulder 23 to fit the shoulder portion 18 of the thimble and present an annular, radial face'24. In the preferred construction shown, the annular face "or ring portion 24 of the head is serrated, as shown. Fitting into the outer end of the o' ening 21 is a disk or cap 25 to bear against t e surface 24, and having an inclined o ening 26 through it for the end portion of t e-rod-11.

against the outer flattened surface 28 of the cap. Interposed between the cap and the serrated surface 24 is a serrated spring 29, preferably of the form indicated in Figs. 3 and 4 and having meeting ends bent to pro.- ject laterally from one face of the spring and present an. attaching lug 30 adapted to engage a notch 31 in the cap 25.

In practice, the parts are-assembled as shown in Figs. 1 and 8, the nut 27 being tightened to press the cap against the brakehead surface 24 through the inte osed friction spring 29. The spring is he d against rotation by the engagement of its lug 30 with the socket in the cap and its engage- -ment with the surface 24 prevents turning of the-brake-head upon the thimble except under great strain such as the braking pressure, by which I mean the pressure employed in a plying the brakes. Any j arrmg to which the'parts may be subjected in transit will not besufficient to cause the brake-head to turn on the thimble. I

When brakes are applied it is desirable that the shoes shall conform closely to the treads of the wheels to present the greatest area of braking surface and prevent unequal wear of the shoes. In the present construcagainst the face 24 by means of the nut 27 serving to produce sufficient friction to prevent turning of the head upon the thimble except under braking pressure;

While I preferrto construct my improvements throughout as shown and described, they may be variously modified in the matter of details of construction Without departing.

from the spirit of my invention as defined by the claims.

What I claim as new and desire to secure by Letters Patent, is-' 1. The combination with a trussed brakebeam having a compression bar and a tension rod, of a non-rotatable thimble on the end of the compression bar and through which the tension-rod p asses, a brake-head surrounding said thimble to rock thereon, a non-rotatable cap on the truss-rod, and means on said rodfor pressing said'cap frictionally against the brake-head, for the purpose set forth.

2. The combination with a brake-beam, of

a non-rotatable thimble thereon, a hrakehead surrounding the thimble to rockthercon, a non-rotatalo1e cap on said brake-beam, africt1on-sprmg interposed between said cap and brake-head, and means for tightening the cap upon said spring, for the purpose set forth.

3. The combination aw ith a brake-beam, of a non-rotatable thimhle thereon, a' brakehead surrounding the thimble, to rock thereon, and having an annular serrated outer face portion, a non-rotatable cap on said brakebeam, an annular serrated friction-spring secured to the cap and interposed between it and said serrated face, and means for tightening the cap upon said spring, for the purpose set forth.

"SVEN J. STRID.

In presence of J. G. ANDERSON, R. RAYMOND. 

